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Diffstat (limited to 'sysdeps/unix/sysv/linux/sh/makecontext.S')
-rw-r--r--sysdeps/unix/sysv/linux/sh/makecontext.S145
1 files changed, 145 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/sh/makecontext.S b/sysdeps/unix/sysv/linux/sh/makecontext.S
new file mode 100644
index 0000000000..877d78d396
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sh/makecontext.S
@@ -0,0 +1,145 @@
+/* Create new context.
+ Copyright (C) 2005 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+/* void __makecontext (struct ucontext *ucp, void (*func)(), int argc, ...);
+ __makecontext sets up a stack and registers for context to run a given
+ function. The registers are set up like this:
+ r4-r7: parameters 1 to 4
+ r8 : uc_link from ucontext structure
+ pc : (*func) pointer
+ pr : address of exitcode
+ r15 : stack pointer for func. */
+
+ .text
+ .align 5
+ENTRY(__makecontext)
+ mov #4, r3
+ mov.l @(oSS_SP,r4), r1
+ mov.l @(oSS_SIZE,r4), r2
+ add r1, r2
+ cmp/gt r6, r3
+ bf/s 1f
+ shlr2 r2
+ sub r6, r2
+ add r3, r2
+1:
+ shll2 r2
+ mov #oR15, r0
+ mov.l @(oLINK,r4), r1
+ mov.l r2, @(r0,r4)
+ mov.l r1, @(oR8,r4)
+ mov #oPC, r0
+ mov.l r5, @(r0,r4)
+
+ cmp/pl r6
+ bf/s .L1
+ dt r6
+ mov.l r7, @(oR4,r4)
+ cmp/pl r6
+ bf/s .L1
+ dt r6
+ mov.l @(0,r15), r1
+ mov.l r1, @(oR5,r4)
+ cmp/pl r6
+ bf/s .L1
+ dt r6
+ mov.l @(4,r15), r1
+ mov.l r1, @(oR6,r4)
+ cmp/pl r6
+ bf/s .L1
+ dt r6
+ mov.l @(8,r15), r1
+ mov.l r1, @(oR7,r4)
+ mov #12,r0
+.L0:
+ cmp/pl r6
+ bf/s .L1
+ dt r6
+ mov.l @(r0,r15), r1
+ mov.l r1, @r2
+ add #4, r0
+ bra .L0
+ add #4, r2
+.L1:
+#ifdef PIC
+ mova .Lexitcode, r0
+#else
+ mov.l .L2, r0
+#endif
+ add #oPR, r4
+ rts
+ mov.l r0, @r4
+#ifndef PIC
+ .align 2
+.L2:
+ .long .Lexitcode
+#endif
+ cfi_endproc
+
+ .align 5
+.Lexitcode:
+ tst r8, r8
+ bt/s 2f
+ mov r8, r4
+#ifdef PIC
+ mova .Lgot, r0
+ mov.l .Lgot, r12
+ add r0, r12
+ mov.l .L3, r1
+ bsrf r1
+.LPCS0:
+ nop
+#else
+ mov.l .L3, r1
+ jsr @r1
+ nop
+#endif
+2:
+ mov.l .L4, r1
+#ifdef PIC
+ add r12, r1
+#endif
+ jsr @r1
+ mov r0, r4
+0:
+ bra 0b
+ nop
+
+ .align 2
+#ifdef PIC
+.Lgot:
+ .long _GLOBAL_OFFSET_TABLE_
+.L3:
+ .long __setcontext@PLT-(.LPCS0+2-(.))
+.L4:
+ .long HIDDEN_JUMPTARGET(exit)@GOTOFF
+#else
+.L3:
+ .long __setcontext
+.L4:
+ .long HIDDEN_JUMPTARGET(exit)
+#endif
+ cfi_startproc
+PSEUDO_END(__makecontext)
+
+weak_alias (__makecontext, makecontext)